Overlapping Connection Electrodes for ESD-Protected Display Emitters
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Solution Overview
Problem
Display devices face damage from static electricity, leading to dark spot defects due to the lack of effective overcurrent protection mechanisms for electrodes and light-emitting elements during manufacturing processes.
Innovation Solution
A display device design featuring first and second connection electrodes with overlapping configurations and insulating layers to create a larger contact area for static electricity discharge, preventing damage by allowing static electricity to escape safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode structures are used without overlapping connection electrodes, then the device structure remains simple, but static electricity causes damage to electrodes and light-emitting elements
Solution Approach 1:
The patent introduces an overlapping configuration in the thickness direction (vertical dimension) between the first connection electrode and second connection electrode. This vertical stacking creates additional discharge paths for static electricity without increasing the horizontal footprint, thus providing protection while maintaining a compact structure.
Solution Approach 2:
The first insulating layer serves as an intermediary between the first connection electrode and second connection electrode. It allows the electrodes to overlap in the thickness direction while maintaining electrical insulation, enabling the creation of a discharge path structure that protects against static electricity without direct short-circuiting.
2Reliability
If the contact area of connection electrodes is small, then the manufacturing process is simpler, but static electricity cannot be effectively discharged
Solution Approach 1:
The patent increases the effective contact area by utilizing the thickness direction for overlapping configuration. The second connection electrode overlaps the first connection electrode vertically, creating a larger three-dimensional contact area that enhances static electricity discharge capability without requiring larger horizontal dimensions that would complicate manufacturing.
Solution Approach 2:
The patent employs a composite structure combining conductive materials (connection electrodes) with insulating materials (first insulating layer). This composite arrangement allows the electrodes to be positioned in an overlapping configuration with controlled contact areas, achieving effective static electricity discharge while maintaining manufacturing feasibility.
3Reliability
If no insulating layer is used between connection electrodes, then the manufacturing process is simpler, but electrodes cannot be properly insulated while overlapping
Solution Approach 1:
The first insulating layer acts as an intermediary substance placed between the first connection electrode and second connection electrode. It provides necessary electrical insulation while allowing the electrodes to maintain their overlapping configuration, thus enabling both insulation and compact structure without excessive complexity.
Solution Approach 2:
The insulating properties are locally applied where needed - specifically in the first insulating layer between the overlapping connection electrodes. This localized insulation approach provides electrical isolation precisely where the overlapping structure creates potential short-circuit risks, without requiring insulation throughout the entire device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents damage to the second connection electrode and light-emitting elements by providing an overcurrent protection structure that allows static electricity to escape, thereby addressing dark spot defects and ensuring the reliability of the display device.
Implementation Method 1
A display device according to an embodiment of the disclosure includes first and second connection electrodes disposed on light-emitting elements, and overlapping each other in a thickness direction, thereby providing a path for discharge of static electricity that may be generated during a process
Data Source
AI summary
A display device comprises first and second electrodes disposed on a substrate, extended parallel to each other, and spaced apart from each other, light-emitting elements disposed on the first electrode and the second electrode, a first insulating layer covering at least a portion of each of the light-emitting elements, a first connection electrode disposed on the light-emitting elements and electrically contacting a first end of each of the light-emitting elements, and a second connection electrode disposed on the light-emitting elements and the first insulating layer and electrically contacting a second end of each of the light-emitting elements, wherein the first connection electrode and the second connection electrode overlap each other in a thickness direction.